New Brass Prop Valve leaks


On my 2nd brass prop valve and it still leaks from the front plunger area when the car is sitting overnight. Converted to vacuum brakes, new booster, new master. Bled everything via vacuum and manual. Pedal feels great, stops great. No idea why it keeps leaking. Its not the lines going in, I've verified that. Any insight would be very helpful as i'm at a loss and don't want to buy another one.
Common problem. Conatct whomever you got the ladt one from and see if theybwill warranty it. We are having the same issue here

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